A wheel edge reducer with central air charging and discharging function

Abstract

This invention discloses a wheel-side reducer with a central inflation / deflation function, solving the technical problems of existing air circuit designs affecting steering knuckle assembly and poor sealing performance of oil-air seal designs. It includes a first oil seal, an oil seal seat, a second oil seal, a steel pipe assembly, a shut-off valve, and inflation / deflation air passages mounted on a bearing housing. The first oil seal, second oil seal, and oil seal seat are fitted together on a bearing support section to form a transition air chamber. The shut-off valve has an inlet, a first valve port, and a second valve port. Its inlet is connected to the outlet on the oil seal seat via the steel pipe assembly. The first valve port is externally connected to the tire inflation / deflation port, and the second valve port is used for tire deflation or for connecting to an external air source to inflate the tire. The inflation / deflation air passages include a first series air passage group mounted on the steering knuckle and a second series air passage group mounted on the bearing housing. One end of the first series air passage group is externally connected to a vehicle air source, and the other end of the second series air passage group is connected to the transition air chamber.

Description

Technical Field

[0001] This invention relates to a central tire inflation / deflation system, specifically to a wheel-side reducer with a central inflation / deflation function. Background Technology

[0002] A 6WD off-road vehicle is a type of vehicle whose power system can drive all six wheels simultaneously. 6WD off-road vehicles exhibit excellent passability and traction in complex road conditions such as wet, slippery surfaces, and uneven road surfaces. With the development of automotive technology, more and more off-road enthusiasts are placing higher demands on the functionality of 6WD off-road vehicles, especially the central tire inflation / deflation system.

[0003] The purpose of a central tire inflation / deflation system is to ensure that the vehicle maintains the appropriate tire pressure during driving, thereby reducing fuel consumption, reducing tire wear, and improving driving safety.

[0004] Chinese invention patent CN115771396A discloses a split-type wheel-side reducer assembly with a central air inflation / deflation system. It includes a steering component comprising a half-shaft tube and a steering knuckle, with the steering knuckle interference-fitted to the half-shaft tube. The half-shaft tube has an inflation channel and a deflation channel, with the deflation channel higher than the inflation channel. The wheel hub assembly includes a wheel hub, brake disc, inner wheel hub bearing, outer wheel hub bearing, oil seal, dust seal, oil-gas seal, retaining ring, tire bolts, and a deflation connector. Both the oil-gas seal and the oil seal are press-fitted into the inner hole of the wheel hub. The inflation channel and the deflation channel are respectively connected to their corresponding oil-gas seals. Although it can achieve central air inflation / deflation, its dual-channel design necessitates changing the steering component to a two-piece structure of half-shaft tube and steering knuckle to adapt to different vehicle models. This results in a complex structure, high manufacturing costs, and the special air channel configuration makes steering knuckle assembly difficult. Meanwhile, the oil-gas seal has poor sealing performance and requires a pressure balancing channel to balance the air pressure inside the channel, which makes the air circuit design complex and increases the risk of leakage. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems in the prior art where the air circuit design affects the assembly of the steering knuckle, and the oil-air seal design has poor sealing performance. Due to the need to balance the air pressure in the air passage, the air circuit design is complicated and the risk of air leakage is increased. The invention provides a wheel-side reducer with a central air filling and emptying function.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wheel-side reducer with a central inflation / deflation function includes a steering knuckle, a wheel hub, a brake drum, a guide wheel, and a bearing housing. The bearing housing includes a steering knuckle connecting seat and a bearing support section. Its special feature is that it also includes a first oil seal, an oil seal seat, a second oil seal, a steel pipe assembly, a shut-off valve, and an inflation / deflation air passage. The oil seal seat is a cylindrical structure with openings at both ends, and an air outlet is provided on it. The first oil seal and the second oil seal are respectively provided at the two openings inside the oil seal seat. The first oil seal, the second oil seal, and the oil seal seat are together fitted onto the bearing support section to form a transition air cavity; The front end of the shut-off valve is connected to the brake drum, and the rear end is fixed on the guide wheel. The shut-off valve has an air inlet, a first valve port and a second valve port. Its air inlet is connected to the air outlet on the oil seal seat through the steel pipe assembly. The first valve port is connected to the tire inflation / deflation port, and the second valve port is used to deflate the tire or to inflate the tire by connecting an external air source. The air supply and discharge system includes a first series air supply group disposed on the steering knuckle and a second series air supply group disposed on the bearing housing. One end of the first series air supply group is connected to the vehicle air source, and the other end is connected to one end of the second series air supply group. The other end of the second series air supply group is connected to the transition air chamber.

[0007] Furthermore, the first series air passage group includes a transverse air passage I, an oblique air passage II, and an axial air passage III, and the second series air passage group includes a transverse air passage IV, a radial air passage V, and an oblique air passage VI disposed on the steering knuckle connecting seat, as well as a transverse air passage VII and a radial air passage VIII disposed on the bearing support section; One end of the transverse air passage I is used to connect to the vehicle's air source, and the other end is connected to the oblique air passage II. One end of the oblique air passage II is connected to one end of the axial air passage III. The other end of the axial air passage III is connected to one end of the transverse air passage IV. The other end of the transverse air passage IV is connected to the radial air passage V. One end of the radial air passage V is connected to the oblique air passage VI. One end of the oblique air passage VI is connected to the transverse air passage VII. One end of the transverse air passage VII is connected to one end of the radial air passage VIII. The other end of the radial air passage VIII is connected to the transition air chamber. The other ends of the inclined airway II, the radial airway V, the inclined airway VI, and the transverse airway VII are all sealed with cylindrical pins.

[0008] Furthermore, the wheel-side reducer with central inflation / deflation function also includes: a first sealing ring and a second sealing ring; The first sealing ring and the second sealing ring are sleeved on the outer peripheral wall of the oil seal seat and located on both sides of the air outlet of the oil seal seat. The outer side walls of the two seals abut against the hub to seal the air outlet of the oil seal seat.

[0009] Furthermore, the steel pipe assembly includes a first hollow bolt, a second hollow bolt, and a steel pipe; The second hollow bolt is fixed on the hub, and one end of it passes through the hub and is inserted into the air outlet of the oil seal seat, communicating with the transition air chamber. The other end of the second hollow bolt is connected to one end of the steel pipe. The first hollow bolt is fixed on the hub, with one end connected to the other end of the steel pipe, and the other end of the first hollow bolt connected to the air inlet of the shut-off valve.

[0010] Furthermore, the steel pipe assembly also includes a first sealing gasket, a second sealing gasket, a third sealing gasket, and a fourth sealing gasket; Both ends of the steel pipe are closed structures. A first through hole is provided radially on one end of the first hollow bolt. After passing through the other end of the steel pipe, it is locked by a first nut. The first through hole communicates with the steel pipe. A first sealing washer is provided between the top surface of the other end of the steel pipe and the first nut. A second sealing washer is provided between the bottom surface of the other end of the steel pipe and the hub, which is used to seal the two connection points between the other end of the steel pipe and the first hollow bolt. The other end of the second hollow bolt is provided with a second through hole along its radial direction. After passing through one end of the steel pipe, it is locked by a second nut. The second through hole communicates with the steel pipe. A third sealing washer is provided between the side wall of one end of the steel pipe and the hub. A fourth sealing washer is provided between the other side wall of one end of the steel pipe and the second nut. These are used to seal the two connection points between one end of the steel pipe and the second hollow bolt.

[0011] Furthermore, the steel pipe assembly also includes a first iron wire and a second iron wire; The first iron wire passes through the second nut and is fixedly connected to one end of the steel pipe; The second wire passes through the first nut and is fixedly connected to the other end of the steel pipe.

[0012] Furthermore, the shut-off valve includes a valve body, a spring, a steel ball, a valve core, a valve core, a valve core cap, and a third hollow bolt; A first cavity, a second cavity, and a third cavity are arranged sequentially from front to back along the centerline of the valve body. The inner diameters of the first cavity and the third cavity are both larger than the inner diameter of the second cavity. The inlet of the first cavity is connected to the outlet of the steel pipe assembly. An annular step is provided in the second cavity, and the spring is provided on the annular step. One end of the spring abuts against the annular step. The steel ball and the valve core are provided in the third cavity. The steel ball is located between the spring and the valve core. The outer peripheral wall of the valve core is threadedly connected to the inner wall of the third cavity. Rotating the valve core causes it to move axially in the third cavity to push the steel ball closer to or away from the spring. A ball socket is provided at the connection between the first cavity and the second cavity. The ball socket is adapted to the steel ball and is used to seal the first cavity. The valve core has a vent pipe at its rear end. One end of the vent pipe is connected to the third cavity, and the other end is sealed by the valve core and valve core cap on the valve core. The valve core is located inside the other end of the vent pipe, and the valve core cap is fitted on the rear end of the valve core and connected to the valve core. The valve core cap is rotated to release air, or the tire is inflated by an external air source connected to the valve core cap. One end of the third hollow bolt passes through the valve body and is connected to the third cavity, while the other end of the third hollow bolt is connected to the tire's inflation / deflation port.

[0013] Furthermore, the shut-off valve also includes an annular septum and an elastic retaining ring; The inner wall of the third cavity is provided with an annular protrusion, the annular spacer is located on the annular protrusion, and the elastic retaining ring is located on the rear side of the annular spacer and is interference-fitted with the inner wall of the third cavity to press the annular spacer. The rear end of the valve core passes through the annular septum and the elastic retaining ring in sequence. A first shoulder is provided on the outer peripheral wall of the valve core. The first shoulder is located between the annular septum and the steel ball. When the valve core is rotated, the first shoulder moves closer to or further away from the annular septum.

[0014] Furthermore, the shut-off valve also includes a third sealing ring and a pipe fitting; A second shoulder is provided on the outer peripheral wall between the first shoulder and the front end of the valve core, and the radial plane of the second shoulder is parallel to the radial plane of the first shoulder. The third sealing ring is located between the first shoulder and the second shoulder and is sleeved on the outer peripheral wall of the valve core. One end of the pipe fitting is adapted to be connected to the inlet of the first cavity, and the other end is adapted to be connected to the outlet of the steel pipe assembly; A fourth sealing ring is provided at the connection between one end of the pipe joint and the inlet of the first cavity, and a fifth sealing ring is provided at the connection between the other end of the pipe joint and the outlet of the steel pipe assembly.

[0015] Furthermore, the inflation / deflation channels are divided into two sets, with the plane containing the bearing housing axis as the reference plane, and the two sets of inflation / deflation channels are arranged in a mirror relationship.

[0016] The beneficial effects of this invention are: 1. This invention provides a wheel-side reducer with a central air inflation / deflation function. By mounting a first oil seal, a second oil seal, and an oil seal seat together on the bearing support section, a transition air chamber is formed. This design is simple in structure, improves the sealing performance of the transition air chamber, and effectively stabilizes the air pressure. Furthermore, by machining the air inflation / deflation channels and connecting them to the steel pipe assembly on the steering knuckle and bearing housing, processing costs are reduced, and production efficiency is improved.

[0017] 2. The present invention provides a wheel-side reducer with a central air filling and defilling function. By designing a first series air passage group and a second series air passage group connected together, the air passage path is the shortest, the cost is low, and the assembly is simple.

[0018] 3. The present invention provides a wheel-side reducer with a central inflation / deflation function. By designing the inflation / deflation air passages into two sets, with the plane containing the bearing housing axis as the reference plane, the two sets of inflation / deflation air passages are set in a mirror relationship. The left and right wheel-side reducers can share the same bearing housing, avoiding the problem of developing a separate bearing housing for the left and right wheel-side reducers, completely solving the risk of misassembly in the workshop, and reducing the management cost of multiple parts.

[0019] 4. The present invention provides a wheel-side reducer with a central inflation / deflation function. By connecting the front end of the shut-off valve to the brake drum and fixing the rear end to the guide wheel, the shut-off valve is designed with an air inlet, a first valve port and a second valve port to realize the central inflation / deflation function, and also has a manual inflation function. The structure is simple and the operation is convenient.

[0020] 5. The present invention provides a wheel-side reducer with a central inflation / deflation function. The shut-off valve serves as the end actuator of the central inflation / deflation function, opening the inflation / deflation passage when the central inflation / deflation function is working and closing the inflation / deflation passage when the central inflation / deflation function is not working. At the same time, when a certain part of the central inflation / deflation function fails, the valve core and valve stem of the shut-off valve can be used to supply air to the tire, thus providing a double insurance function. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of a wheel-side reducer with a central inflation / deflation function according to the present invention; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 yes Figure 2 Sectional view at point BB; Figure 4 yes Figure 2 A sectional view at point BB (showing sections A, B, C, D, and E); Figure 5 yes Figure 4 Enlarged view of a section at point B in the middle; Figure 6 yes Figure 4 Enlarged view of a section at point C; Figure 7 yes Figure 4 Enlarged view of a portion of point A in the middle; Figure 8 yes Figure 4 Enlarged view of a section at point E in the middle; Figure 9 yes Figure 4 Enlarged view of a section at point D; Figure 10 This is a three-dimensional structural diagram of the bearing housing inflation / deflation air passage in an embodiment of a wheel-side reducer with a central inflation / deflation function according to the present invention. Figure 11 This is a schematic diagram of the connection relationship of the steel pipe assembly in an embodiment of the wheel-side reducer with central air inflation / deflation function according to the present invention; Figure 12 This is a schematic diagram of the shut-off valve in the closed state of an embodiment of a wheel-side reducer with a central air inflation / deflation function according to the present invention; Figure 13 This is a schematic diagram of the shut-off valve in the open state of an embodiment of a wheel-side reducer with a central inflation / deflation function according to the present invention.

[0022] The attached figures are labeled as follows: 1. Steering knuckle; 2. Brake drum; 3. Guide wheel; 4. Shut-off valve; 401. Valve body; 402. Spring; 403. Steel ball; 404. Valve core; 405. Third sealing ring; 406. Valve core; 407. Valve core cap; 408. Elastic retaining ring; 409. Annular septum; 410. Third hollow bolt; 5. First cylindrical pin; 6. Bearing housing; 7. First oil seal; 8. Oil seal seat; 9. Second oil seal; 10. Steel pipe; 11. First hollow bolt; 12. First sealing washer; 13. Second... 14. Sealing gasket; 15. Pipe fitting; 16. Fourth sealing ring; 17. Fifth sealing ring; 18. First sealing ring; 19. Wheel hub; 20. Second sealing ring; 21. Second cylindrical pin; 22. Sixth sealing ring; 23. Third cylindrical pin; 24. Fourth cylindrical pin; 25. Fifth cylindrical pin; 26. Sixth cylindrical pin; 27. Seventh sealing ring; 28. Third sealing gasket; 29. ​​Fourth sealing gasket; 30. Second hollow bolt; 31. First iron wire; 32. Second iron wire. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1As shown in the figure, an embodiment of the present invention provides a wheel-side reducer with a central inflation / deflation function, including a steering knuckle 1, a brake drum 2, a bearing housing 6, a guide wheel 3, a wheel hub 18, a first oil seal 7, an oil seal seat 8, a second oil seal 9, a first sealing ring 17, a second sealing ring 19, cylindrical pins, a steel pipe assembly, a shut-off valve 4, and an inflation / deflation air passage. The bearing housing 6 includes a steering knuckle connecting seat and a bearing support section. The air inlet of the inflation / deflation air passage is located on the side of the steering knuckle 1, and its end is the shut-off valve 4. The front end of the shut-off valve 4 is connected to the brake drum 2, and the rear end is fixed to the guide wheel 3 by bolts. The cylindrical pin includes a first cylindrical pin 5, a second cylindrical pin 20, a third cylindrical pin 22, a fourth cylindrical pin 23, a fifth cylindrical pin 24, a sixth cylindrical pin 25, and a seventh cylindrical pin 27.

[0025] The oil seal seat 8 is a cylindrical structure with openings at both ends and an air outlet. A first oil seal 7 and a second oil seal 9 are respectively installed at the two openings inside the oil seal seat 8. The first oil seal 7, the second oil seal 9 and the oil seal seat 8 are fitted together on the bearing support section to form a transition air chamber. The first sealing ring 17 and the second sealing ring 19 are fitted on the outer peripheral wall of the oil seal seat 8 and are located on both sides of the air outlet of the oil seal seat 8. The outer walls of the two rings abut against the hub 18 to seal the air outlet of the oil seal seat 8.

[0026] like Figure 2-4 As shown, the air supply system includes a first series air supply group mounted on the steering knuckle 1 and a second series air supply group mounted on the bearing housing 6. One end of the first series air supply group is connected to the vehicle's air source, and the other end is connected to one end of the second series air supply group. The other end of the second series air supply group is connected to the transition air chamber. There are two sets of air supply systems, and the two sets are arranged in a mirror image relationship with the plane containing the centerline of the bearing housing 6 as the reference plane.

[0027] The first series air passage group includes a transverse air passage I, an oblique air passage II, and an axial air passage III. The second series air passage group includes a transverse air passage IV, a radial air passage V, and an oblique air passage VI, which are installed on the steering knuckle connecting seat, and a transverse air passage VII and a radial air passage VIII, which are installed on the bearing support section; wherein the axial air passage III is arranged at point M at the end of the oblique air passage II.

[0028] The air inlet at one end of the transverse air passage I is internally threaded, which is used to reserve an interface for the vehicle's air circuit to connect to the vehicle's air source. The other end is connected to the oblique air passage II. One end of the oblique air passage II is connected to one end of the axial air passage III. A seventh sealing ring 26 and a sixth sealing ring 21 are provided between the steering knuckle 1 and the steering knuckle connecting seat of the bearing housing 6 to prevent gas leakage. The other end of the axial air passage III is connected to one end of the transverse air passage IV. The other end of the transverse air passage IV is connected to the radial air passage V. One end of the radial air passage V is connected to the oblique air passage VI. One end of the oblique air passage VI is connected to the transverse air passage VII. One end of the transverse air passage VII is connected to one end of the radial air passage VIII. The other end of the radial air passage VIII is connected to the transition air chamber. The other end of the inclined air passage II is sealed with the first cylindrical pin 5 to block the air passage and prevent gas leakage. The other end of the radial air passage V is sealed with the seventh cylindrical pin 27. The other end of the inclined air passage VI is sealed with the sixth cylindrical pin 25. The other end of the transverse air passage VII is sealed with the fifth cylindrical pin 24. In this embodiment, all cylindrical pins are installed by interference fit.

[0029] Because the wheel-side reducers on the left and right sides of the vehicle are mirror images of each other, this is mainly reflected in the steering knuckle 1, where the steering knuckle 1 of the left and right wheel-side reducers is a mirror image. This causes the lateral air passage I, oblique air passage II, and axial air passage III on the left and right steering knuckles to also be mirror images of each other. To improve the versatility of parts, two sets of second tandem air passage groups are symmetrically arranged on the bearing housing 6. Each set of second tandem air passage groups includes: lateral air passage IV, radial air passage V, oblique air passage VI, lateral air passage VII, and radial air passage VIII. That is, the bearing housing 6 can simultaneously match both left and right steering knuckles 1. Figure 4 As shown, one set of air passages above the bearing housing 6 is used by the left steering knuckle 1, at which time the lower air passage IV is blocked by the left steering knuckle 1; the other set of air passages is used by the right steering knuckle 1, at which time the upper air passage IV is blocked by the right steering knuckle 1.

[0030] like Figure 5 As shown, the steel pipe assembly includes a first hollow bolt 11, a second hollow bolt 30, a first sealing washer 12, a second sealing washer 13, a third sealing washer 28, a fourth sealing washer 29, a first iron wire 31, a second iron wire 32, and a steel pipe 10. The second hollow bolt 30 is fixed on the hub 18, with one end passing through the hub 18 and inserted into the air outlet of the oil seal seat 8, communicating with the transition air chamber. The other end of the second hollow bolt 30 is connected to one end of the steel pipe 10. The insertion of one end of the second hollow bolt 30 into the air outlet of the oil seal seat 8 has two main purposes: first, to allow air to pass through, and second, to axially limit the oil seal seat 8 to prevent it from moving left and right.

[0031] The first hollow bolt 11 is fixed on the hub 18, with one end connected to the other end of the steel pipe 10, and the other end of the first hollow bolt 11 connected to the air inlet of the shut-off valve 4.

[0032] Both ends of the steel pipe 10 are closed structures. A first through hole is provided on one end of the first hollow bolt 11 along its radial direction. After passing through the other end of the steel pipe 10, it is locked by the first nut. The first through hole is connected to the steel pipe 10. A first sealing washer 12 is provided between the top surface of the other end of the steel pipe 10 and the first nut. A second sealing washer 13 is provided between the bottom surface of the other end of the steel pipe 10 and the hub 18 to seal the two connection points between the other end of the steel pipe 10 and the first hollow bolt 11. The other end of the second hollow bolt 30 has a second through hole arranged radially. After passing through one end of the steel pipe 10, it is locked by the second nut. The second through hole is connected to the steel pipe 10. A third sealing washer 28 is provided between the side wall of one end of the steel pipe 10 and the hub 18. A fourth sealing washer 29 is provided between the other side wall of one end of the steel pipe 10 and the second nut to seal the two connection points between one end of the steel pipe 10 and the second hollow bolt 30.

[0033] To prevent the first hollow bolt 11 and the second hollow bolt 30 from loosening and falling off during vehicle operation, the first wire 31 passes through the second nut and is fixedly connected to one end of the steel pipe 10; the second wire 32 passes through the first nut and is fixedly connected to the other end of the steel pipe 10.

[0034] The front end of the shut-off valve 4 is connected to the brake drum 2, and the rear end is fixed on the guide wheel 3. The shut-off valve 4 has an air inlet, a first valve port and a second valve port. Its air inlet is connected to the air outlet on the oil seal seat 8 through a steel pipe assembly. The first valve port is connected to the tire inflation / deflation port, and the second valve port is used to deflate the tire or to connect an external air source to inflate the tire. like Figure 6-7 As shown, the shut-off valve 4 includes a valve body 401, a spring 402, a steel ball 403, a valve core 404, a valve core 406, a valve core cap 407, a third hollow bolt 410, an annular septum 409, a third sealing ring 405, a pipe joint 14, and an elastic retaining ring 408. Along the axis of valve body 401, from front to back, there are a first cavity, a second cavity, and a third cavity connected in sequence. The inner diameter of the first cavity and the third cavity is larger than that of the second cavity. The inlet of the first cavity is connected to the outlet of the steel pipe assembly. An annular step is provided in the second cavity, and a spring 402 is provided on the annular step. One end of the spring 402 abuts against the annular step. A steel ball 403 and a valve core 404 are provided in the third cavity. The steel ball 403 is located between the spring 402 and the valve core 404. The outer peripheral wall of the valve core 404 is threadedly connected to the inner wall of the third cavity. Rotating the valve core 404 causes it to move axially in the third cavity to push the steel ball 403 closer to or away from the spring 402. A ball socket is provided at the connection between the first cavity and the second cavity. The ball socket is adapted to the steel ball 403 and is used to seal the first cavity. A vent pipe is provided at the rear end of the valve core 404. One end of the vent pipe is connected to the third cavity, and the other end is sealed by the valve core 406 and valve core cap 407 provided on the valve core 404. The valve core 406 is located inside the other end of the vent pipe, and the valve core cap 407 is sleeved on the rear end of the valve core 404 and connected to the valve core 404. The valve core cap 407 is rotated to release air, or the tire is inflated by an external air source connected to the valve core cap 407. One end of the third hollow bolt 410 passes through the valve body 401 and is connected to the third cavity. The other end of the third hollow bolt 410 is connected to the tire inflation / deflation port.

[0035] An annular protrusion is provided on the inner wall of the third cavity, an annular septum 409 is located on the annular protrusion, and an elastic retaining ring 408 is provided on the rear side of the annular septum 409 and is interference-fitted with the inner wall of the third cavity to press the annular septum 409. The rear end of the valve core 404 passes through the annular septum 409 and the elastic retaining ring 408 in sequence. A first shoulder is provided on the outer peripheral wall of the valve core 404. The first shoulder is located between the annular septum 409 and the steel ball 403. When the valve core 404 is rotated, the first shoulder moves closer to or further away from the annular septum 409.

[0036] A second shoulder is provided on the outer peripheral wall between the first shoulder and the front end of the valve core 404, and the radial plane of the second shoulder is parallel to the radial plane of the first shoulder. A third sealing ring 405 is located between the first shoulder and the second shoulder and is sleeved on the outer peripheral wall of the valve core 404. One end of the pipe connector 14 is adapted to be connected to the inlet of the first cavity, and the other end is adapted to be connected to the outlet of the steel pipe assembly. A fourth sealing ring 15 is provided at one end of the pipe joint 14 where it connects to the inlet of the first cavity, and a fifth sealing ring 16 is provided at the other end of the pipe joint 14 where it connects to the outlet of the steel pipe assembly.

[0037] Rotating the valve core 404 causes it to move forward, which in turn pushes the steel ball 403 towards the spring 402. The steel ball 403 rests against the ball socket of the valve body 401, and the spherical surface of the steel ball 403 and the ball socket of the valve body 401 make contact, thus sealing the valve. Gas entering from the front end of the valve body 401 is blocked by the steel ball 403, thereby closing the shut-off valve 4. At this time, the spring 402 is compressed. The vent pipe on the valve core 404 is connected to the third hollow bolt 410. By rotating the valve cap 407, the tire can be deflated, or by connecting an external air source. Rotating the valve cap 407 can be done manually or by controlling a solenoid valve, which is existing technology and will not be described in detail here. When the shut-off valve 4 needs to be opened to inflate the tire, the valve core 404 moves backward and contacts the annular septum 409. The spring 402, which is in a compressed state, pushes the steel ball 403 open under the action of the spring force. At this time, the steel ball 403 and the ball socket of the valve body 401 are no longer in contact, leaving a gap. The gas entering from the front end of the valve body 401 directly enters the third hollow bolt 410, which is connected to the external tire. This realizes the opening state of the shut-off valve and inflates the tire.

[0038] When the shut-off valve 4 is closed: High-pressure gas → Lateral air passage I → Inclined air passage II → Axial air passage III → Lateral air passage IV → Radial air passage V → Inclined air passage VI → Lateral air passage VII → Radial air passage VIII → Transition air chamber → Second hollow bolt 30 → Steel pipe 10 → First hollow bolt 11 → Shut-off valve 4. When the shut-off valve 4 is closed, the tire is not inflated.

[0039] When the shut-off valve 4 is open: High-pressure gas → transverse air passage I → oblique air passage II → axial air passage III → transverse air passage IV → radial air passage V → oblique air passage VI → transverse air passage VII → radial air passage VIII → transition air chamber → second hollow bolt 30 → steel pipe 10 → first hollow bolt 11 → shut-off valve 4. When the shut-off valve 4 is open, the high-pressure gas inflates the tire through the third hollow bolt 410. The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wheel-side reducer with a central inflation / deflation function, comprising a steering knuckle (1), a wheel hub (18), a brake drum (2), a guide wheel (3), and a bearing housing (6), wherein the bearing housing (6) comprises a steering knuckle connecting seat and a bearing support section; characterized in that: It also includes a first oil seal (7), an oil seal seat (8), a second oil seal (9), a steel pipe assembly, a stop valve (4), and a charging / discharging air passage; The oil seal seat (8) is a cylindrical structure with openings at both ends, and an air outlet is provided on it. The first oil seal (7) and the second oil seal (9) are respectively provided at the two openings inside the oil seal seat (8). The first oil seal (7), the second oil seal (9) and the oil seal seat (8) are together sleeved on the bearing support section to form a transition air cavity; The front end of the shut-off valve (4) is connected to the brake drum (2), and the rear end is fixed on the guide wheel (3). The shut-off valve (4) has an air inlet, a first valve port and a second valve port. Its air inlet is connected to the air outlet on the oil seal seat (8) through the steel pipe assembly. The first valve port is connected to the tire inflation / deflation port, and the second valve port is used to deflate the tire or to connect an external air source to inflate the tire. The shut-off valve (4) includes a valve body (401), a spring (402), a steel ball (403), a valve core (404), a valve core (406), a valve core cap (407), and a third hollow bolt (410). A first cavity, a second cavity, and a third cavity are arranged sequentially from front to back along the axis of the valve body (401). The inner diameters of the first cavity and the third cavity are both larger than the inner diameter of the second cavity. The inlet of the first cavity is connected to the outlet of the steel pipe assembly. An annular step is provided in the second cavity, and the spring (402) is provided on the annular step. One end of the spring (402) abuts against the annular step. The steel ball (403) and the valve core (404) are provided in the third cavity. The steel ball (403) is located between the spring (402) and the valve core (404). The outer peripheral wall of the valve core (404) is threadedly connected to the inner wall of the third cavity. Rotating the valve core (404) causes it to move axially in the third cavity, thereby pushing the steel ball (403) closer to or away from the spring (402). A ball socket is provided at the connection between the third cavity and the second cavity. The ball socket is adapted to the steel ball (403) and is used to seal the first cavity. The valve core (404) has a vent pipe at its rear end. One end of the vent pipe is connected to the third cavity, and the other end is sealed by the valve core (406) and valve cap (407) on the valve core (404). The valve core (406) is located inside the other end of the vent pipe. The valve cap (407) is sleeved on the rear end of the valve core (404) and connected to the valve core (404). The valve cap (407) is rotated to release air, or the tire is inflated by connecting an external air source through the valve cap (407). One end of the third hollow bolt (410) passes through the valve body (401) and is connected to the third cavity; the other end of the third hollow bolt (410) is connected to the tire inflation / deflation port. The air supply and discharge channels include a first series air supply group provided on the steering knuckle (1) and a second series air supply group provided on the bearing seat (6). One end of the first series air supply group is connected to the vehicle air source, and the other end is connected to one end of the second series air supply group. The other end of the second series air supply group is connected to the transition air chamber.

2. The wheel-side reducer with central inflation / deflation function according to claim 1, characterized in that: The first series air passage group includes a transverse air passage I, an oblique air passage II, and an axial air passage III. The second series air passage group includes a transverse air passage IV, a radial air passage V, and an oblique air passage VI disposed on the steering knuckle connecting seat, and a transverse air passage VII and a radial air passage VIII disposed on the bearing support section. One end of the transverse air passage I is used to connect to the vehicle's air source, and the other end is connected to the oblique air passage II. One end of the oblique air passage II is connected to one end of the axial air passage III. The other end of the axial air passage III is connected to one end of the transverse air passage IV. The other end of the transverse air passage IV is connected to the radial air passage V. One end of the radial air passage V is connected to the oblique air passage VI. One end of the oblique air passage VI is connected to the transverse air passage VII. One end of the transverse air passage VII is connected to one end of the radial air passage VIII. The other end of the radial air passage VIII is connected to the transition air chamber. The other ends of the inclined airway II, the radial airway V, the inclined airway VI, and the transverse airway VII are all sealed with cylindrical pins.

3. The wheel-side reducer with central inflation / deflation function according to claim 1, characterized in that: It also includes: a first sealing ring (17) and a second sealing ring (19); The first sealing ring (17) and the second sealing ring (19) are fitted on the outer peripheral wall of the oil seal seat (8) and located on both sides of the air outlet of the oil seal seat (8). The outer side walls of the two seals abut against the hub (18) to seal the air outlet of the oil seal seat (8).

4. The wheel-side reducer with central inflation / deflation function according to claim 1, characterized in that: The steel pipe assembly includes a first hollow bolt (11), a second hollow bolt (30), and a steel pipe (10); The second hollow bolt (30) is fixed on the hub (18), and one end of it passes through the hub (18) and is inserted into the air outlet of the oil seal seat (8) to communicate with the transition air chamber. The other end of the second hollow bolt (30) is connected to one end of the steel pipe (10). The first hollow bolt (11) is fixed on the hub (18), with one end connected to the other end of the steel pipe (10), and the other end of the first hollow bolt (11) connected to the air inlet of the shut-off valve (4).

5. The wheel-side reducer with central inflation / deflation function according to claim 4, characterized in that: The steel pipe assembly also includes a first sealing gasket (12), a second sealing gasket (13), a third sealing gasket (28) and a fourth sealing gasket (29). Both ends of the steel pipe (10) are closed structures. A first through hole is provided on one end of the first hollow bolt (11) along its radial direction. After passing through the other end of the steel pipe (10), it is locked by the first nut. The first through hole is connected to the steel pipe (10). A first sealing washer (12) is provided between the top surface of the other end of the steel pipe (10) and the first nut. A second sealing washer (13) is provided between the bottom surface of the other end of the steel pipe (10) and the hub (18) to seal the two connection points between the other end of the steel pipe (10) and the first hollow bolt (11). The other end of the second hollow bolt (30) is provided with a second through hole along its radial direction. After passing through one end of the steel pipe (10), it is locked by the second nut. The second through hole is connected to the steel pipe (10). The third sealing washer (28) is provided between the side wall of one end of the steel pipe (10) and the hub (18). The fourth sealing washer (29) is provided between the other side wall of one end of the steel pipe (10) and the second nut, for sealing the two connection points between one end of the steel pipe (10) and the second hollow bolt (30).

6. The wheel-side reducer with central inflation / deflation function according to claim 5, characterized in that: The steel pipe assembly also includes a first iron wire (31) and a second iron wire (32). The first wire (31) passes through the second nut and is fixedly connected to one end of the steel pipe (10); The second wire (32) passes through the first nut and is fixedly connected to the other end of the steel pipe (10).

7. The wheel-side reducer with central inflation / deflation function according to claim 1, characterized in that: The shut-off valve (4) also includes an annular septum (409) and an elastic retaining ring (408). The inner wall of the third cavity is provided with an annular protrusion, and the annular septum (409) is located on the annular protrusion. The elastic retaining ring (408) is located on the rear side of the annular septum (409) and is interference-fitted with the inner wall of the third cavity to press the annular septum (409). The rear end of the valve core (404) passes through the annular septum (409) and the elastic retaining ring (408) in sequence. A first shoulder is provided on the outer peripheral wall of the valve core (404). The first shoulder is located between the annular septum (409) and the steel ball (403). When the valve core (404) is rotated, the first shoulder moves closer to or further away from the annular septum (409).

8. The wheel-side reducer with central inflation / deflation function according to claim 7, characterized in that: The shut-off valve (4) also includes a third sealing ring (405) and a pipe fitting (14). A second shoulder is provided on the outer peripheral wall between the first shoulder and the front end of the valve core (404), and the radial plane of the second shoulder is parallel to the radial plane of the first shoulder. The third sealing ring (405) is located between the first shoulder and the second shoulder and is sleeved on the outer peripheral wall of the valve core (404). One end of the pipe fitting (14) is adapted to be connected to the inlet of the first cavity, and the other end is adapted to be connected to the outlet of the steel pipe assembly; A fourth sealing ring (15) is provided at one end of the pipe joint (14) where it is connected to the inlet of the first cavity, and a fifth sealing ring (16) is provided at the other end of the pipe joint (14) where it is connected to the outlet of the steel pipe assembly.

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